Countersinks

Countersink cutter drill bits are designed to fit directly into manual, electric and cordless drill driver attachments and have hexagonal or round shanks. Countersink cutters are used to create a chamfer around rim of a pilot hole enabling the head of a countersunk screw to sit flush. Countersink cutters can also be used to remove the burr left from a drilling or tapping operation.Types of Countersink Cutters
  1. Cross-Hole Countersink Cutter: These have a hole that goes through the side of the cone that provides the cutting edge. These countersink cutters are suitable for deburring and can also be used in soft materials such as wood or plastic to create a countersunk hole. The design of these countersink cutters means that they are free from mechanical vibration or 'chatter' and they also stay on centre.
  2. Fluted Countersink cutter: These have fluted blades that produce a heavy chamfer to create the correct seating for a countersunk-head screw. Countersink cutters are available with six different cutting angles but the most common are 82° and 90°. The number of flutes on the countersink cutter can also vary.
    • Single fluted: These have less chatter or mechanical vibration than multi-fluted and are ideal for using in small holes for general purpose countersinking, chamfering and deburring. These are designed for machine use and light portable work when operating at higher speeds.
    • Three fluted: These are designed for a chatter free performance and are used mainly in portable applications at slower speeds. The design of these countersinks gives them a good centering ability.
    • Four fluted: These have good radial relief
    • Five Fluted: These have a rugged design and the odd number of flutes minimises chatter
    • Six fluted: These are ideal for producing fast shearing cuts
MaterialsThese countersink cutter drill bits are made from HSS (High-Speed Steel) which can withstand high temperatures without losing its hardness.

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Description Price Head Diameter Countersink Angle Number of Flutes Material Overall Length Shank Diameter Shank Length
RS Stock No. 508-9020
Mfr. Part No.05643
BrandEXACT
TWD341.00
Each
units
10.4mm 90° 3 HSS 34 mm 1/4 in -
RS Stock No. 509-0036
Mfr. Part No.05510
BrandEXACT
TWD237.00
Each
units
8.3mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 499-413
Mfr. Part No.4405720
BrandEXACT
TWD888.00
Each
units
20.5mm 90° 3 HSS-E 63 mm 10 mm -
RS Stock No. 508-8819
Mfr. Part No.05506
BrandEXACT
TWD218.00
Each
units
6.3mm 90° 3 HSS 45 mm 5 mm -
RS Stock No. 508-9193
Mfr. Part No.05424
BrandEXACT
TWD1,219.00
Each
units
28mm 90° - HSS-E 84 mm - -
RS Stock No. 499-368
Mfr. Part No.4405722
BrandEXACT
TWD1,120.00
Each
units
25mm 90° 3 HSS-E 67 mm 10 mm -
RS Stock No. 508-8932
Mfr. Part No.05642
BrandEXACT
TWD267.00
Each
units
8.3mm 90° 3 HSS 31 mm 1/4 in -
RS Stock No. 509-0008
Mfr. Part No.05522
BrandEXACT
TWD639.00
Each
units
25mm 90° 3 HSS 67 mm 10 mm -
RS Stock No. 508-9092
Mfr. Part No.05644
BrandEXACT
TWD342.00
Each
units
12.4mm 90° 3 HSS 35 mm 1/4 in -
RS Stock No. 508-9042
Mfr. Part No.05641
BrandEXACT
TWD284.00
Each
units
6.3mm 90° 3 HSS 31 mm 1/4 in -
RS Stock No. 508-8954
Mfr. Part No.05423
BrandEXACT
TWD616.00
Each
units
21mm 90° - HSS-E 65 mm - -
RS Stock No. 499-407
Mfr. Part No.4405715
BrandEXACT
TWD540.00
Each
units
12.4mm 90° 3 HSS-E 56 mm 8 mm -
RS Stock No. 508-9070
Mfr. Part No.05518
BrandEXACT
TWD366.00
Each
units
16.5mm 90° 3 HSS 60 mm 10 mm -
RS Stock No. 508-9799
Mfr. Part No.05515
BrandEXACT
TWD307.00
Each
units
12.4mm 90° 3 HSS 56 mm 8 mm -
RS Stock No. 509-0014
Mfr. Part No.05513
BrandEXACT
TWD286.00
Each
units
10.4mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 499-396
Mfr. Part No.4405713
BrandEXACT
TWD519.00
Each
units
10.4mm 90° 3 HSS-E 50 mm 6 mm -
RS Stock No. 508-8998
Mfr. Part No.05646
BrandEXACT
TWD483.00
Each
units
20.5mm 90° 3 HSS 41 mm 1/4 in -
RS Stock No. 499-403
Mfr. Part No.4405718
BrandEXACT
TWD652.00
Each
units
16.5mm 90° 3 HSS-E 60 mm 10 mm -
RS Stock No. 508-9064
Mfr. Part No.05520
BrandEXACT
TWD514.00
Each
units
20.5mm 90° 3 HSS 63 mm 10 mm -
RS Stock No. 508-8976
Mfr. Part No.05421
BrandEXACT
TWD314.00
Each
units
10mm 90° - HSS-E 45 mm - -